摘要
以铜离子为印迹物,二乙基三胺为固化剂,聚乙二醇(PEG-2000)为致孔剂,按一定比例与环氧树脂混合后在无扰动模式下聚合。反应结束后除去致孔剂和印迹离子成功地得到了一种铜离子印迹的大尺寸环氧树脂基聚合物整体柱。以此作为固相萃取柱,结合原子吸收光谱建立了用于水溶液中铜离子高选择性的富集分离测定方法。详细研究了介质酸度、吸附容量、吸附选择性、分析精密度和准确度等内容,结果满意。
A novel Cu（ Ⅱ ）-imprinted monolithic polymer was prepared by step-polymerization reaction of epoxy resin. A homogenous mixture of epoxy resin, diethylenetriarnine as curing agent, copper ion as target molecule and polyethylene glycol as poreforming reagent was poured into a glass-tube and polymerized under controlled reaction temperature and time. The PEG and copper ions were all removed from the solid product by deionized water and strong acid, respectively. The Cu（ Ⅱ ）-imprinted epoxy resin-based monolithic porous polymer was successfully obtained, which was used as solid-phase extraction matrix for preconcentration and separation of trace copper ions in aqueous solution for determination by atomic adsorption spectrometry. The effect of pH on adsorption, maximum adsorption capacity, selectivity, analytical precision and availability was investigated in details by a series of experiments. Under the optimized enrichment conditions, i.e. pH 5.0-9. 0 of medium and flow rate below 5.0 mL · min^-1, the recovery of Cu（ Ⅱ ） ions in the aqueous solution could be over 95%. The maximum adsorption capacity is 126 mg Cu （ Ⅱ ） · g^-1 dried resin. The selective recognition ability of Cu（ Ⅱ ）-imprinted monolithic column is evidently preponderant over the non-imprinted materials. The up-loaded column could be completely eluted with 1.0 mol · L^-1 HNO3 and flow rate below 2. 0 mL · min^-1. The proposed procedure was applied to the analysis of a mixed sample with satisfied result.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2008年第10期2446-2449,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(20674041)
宁波市自然科学基金项目(2007A610032)
浙江省教育厅项目(20070968)资助
关键词
整体柱
环氧树脂
聚乙二醇
离子印迹
原子吸收光谱
Monolithic polymer
Epoxy resin
Polyethylene glycol
Ion imprinting
Atomic absorption spectroscopy
